As we approach the centenary of the outbreak of the First World War, books, television documentaries and articles on the subject abound. So do different opinions, especially as to whether Britain’s engagement was worth it.Was it a vitally important crusade to prevent an oppressive German-dominated Europe Or a catastrophic mistake that brought Communism to power in Russia, ripped up the map of Europe and left a festering sense of resentment that would fuel the rise of NazismIn this debate from April 2014 four of Britain’s leading historians battle it over whether or not Britain should have fought in the First World War. Professor John Charmley and Domnic Sandbrook speak for the motion. Max Hastings and Professor Margaret MacMillan speak against.